package com.atlige.gzmall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atlige.common.constant.CartConstant;
import com.atlige.common.to.mq.OrderTo;
import com.atlige.common.to.mq.StockDetailTo;
import com.atlige.common.to.mq.StockLockedTo;
import com.atlige.common.utils.R;
import com.atlige.common.exception.NoStockException;
import com.atlige.gzmall.ware.entity.WareOrderTaskDetailEntity;
import com.atlige.gzmall.ware.entity.WareOrderTaskEntity;
import com.atlige.gzmall.ware.feign.OrderFeignService;
import com.atlige.gzmall.ware.feign.ProductFeignService;
import com.atlige.gzmall.ware.service.WareOrderTaskDetailService;
import com.atlige.gzmall.ware.service.WareOrderTaskService;
import com.atlige.gzmall.ware.vo.OrderItemVo;
import com.atlige.gzmall.ware.vo.OrderVo;
import com.atlige.gzmall.ware.vo.SkuHasStockVo;
import com.atlige.gzmall.ware.vo.WareSkuLockVo;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.apache.commons.lang3.StringUtils;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atlige.common.utils.PageUtils;
import com.atlige.common.utils.Query;

import com.atlige.gzmall.ware.dao.WareSkuDao;
import com.atlige.gzmall.ware.entity.WareSkuEntity;
import com.atlige.gzmall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;

//@RabbitListener(queues = "stock.release.stock.queue")
@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {
    @Autowired
    ProductFeignService productFeignService;
    @Autowired
    WareSkuDao wareSkuDao;
    @Autowired
    RabbitTemplate rabbitTemplate;
    @Autowired
    WareOrderTaskDetailService taskDetailService;
    @Autowired
    WareOrderTaskService taskService;
    @Autowired
    OrderFeignService orderFeignService;


    private void unlockStock(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        // 库存解锁
        wareSkuDao.unlockStock(skuId, wareId, num);
        // 更新库存工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2); // 变为已解锁
        taskDetailService.updateById(entity);
    }


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();
//        wareId: 123,//仓库id
//        skuId: 123//商品id
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) wrapper.eq("sku_id", skuId);
        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)) wrapper.eq("ware_id", wareId);
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wrapper
        );

        return new PageUtils(page);
    }

    @Transactional
    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        // 1、判断如果还没有这个库存记录，则新增
        List<WareSkuEntity> entities = this.baseMapper.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (entities == null || entities.size() == 0){
            WareSkuEntity wareSkuEntity = new WareSkuEntity();
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setWareId(wareId);
            wareSkuEntity.setStock(skuNum);
            wareSkuEntity.setStockLocked(0);
            // TODO 查询sku的名字,如果失败，不回滚 高级部分
            // 1. 自己catch异常
            try {
                R info = productFeignService.info(skuId);
                Map<String, Object> skuInfo = (Map<String, Object>) info.get("skuInfo");
                if (info.getCode() == 1){
                    wareSkuEntity.setSkuName((String) skuInfo.get("skuName"));
                }
            }catch (Exception e){

            }
            this.baseMapper.insert(wareSkuEntity);
        }else {
            this.baseMapper.addStock(skuId, wareId, skuNum);
        }
    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        return skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            // 查询当前sku的总库存量
            Long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count == null ? false : count > 0);
            return vo;
        }).collect(Collectors.toList());

    }

    /**
     * 为某个订单锁定库存
     * @Transactional(rollbackFor = NoStockException.class) ： 默认只要是运行时异常都会回滚
     *
     * 库存解锁的场景
     * 1、下单成功，订单过期没有支付被系统自动取消 / 被用户手动取消，都需要解锁库存
     * 2、下订单成功，库存锁成功，接下来的业务调用失败，导致订单回滚。之前锁定的库存需要自动解锁
     *
     * @param vo
     * @return
     */
    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单详情
         * 追溯
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        taskService.save(taskEntity);
        // 1、按照下单的收货地址，找到一个就近仓库，锁定库存
        // 找到每个商品在哪个仓库有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            Long skuId = item.getSkuId();
            SkuWareHasStock hasStock = new SkuWareHasStock();
            hasStock.setSkuId(skuId);
            hasStock.setNum(item.getCount());
            // 这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            hasStock.setWareId(wareIds);
            return hasStock;
        }).collect(Collectors.toList());
        Boolean allLock = true;
        // 2、锁库存
        for (SkuWareHasStock skuWareHasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = skuWareHasStock.getSkuId();
            List<Long> wareIds = skuWareHasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0){
                // 没有任何仓库有某件商品的库存
                throw new NoStockException(skuId);
            }
            // 1、如果每个商品都锁定成功，将当前商品锁定了几件的工作单记录发送给MQ
            // 2、锁定失败。前面保存的工作单就回滚了，发出去的消息，即使要解锁，由于需要去数据库查不到id，所以也不用解锁
            for (Long wareId : wareIds) {
                // 成功返回1，失败为0
                Long res = wareSkuDao.lockSkuStock(skuId, wareId, skuWareHasStock.getNum());
                if (res == 1){
                    // 锁成功
                    skuStocked = true;
                    // TODO 告诉MQ，库存锁定成功
                    WareOrderTaskDetailEntity detailEntity = new WareOrderTaskDetailEntity(null,
                            skuId, "", skuWareHasStock.getNum(), taskEntity.getId(), wareId, 1);
                    taskDetailService.save(detailEntity);
                    StockLockedTo stockLockedTo = new StockLockedTo();
                    stockLockedTo.setId(taskEntity.getId());
                    StockDetailTo target = new StockDetailTo();
                    BeanUtils.copyProperties(detailEntity, target);
                    // 只发id不行，防止回滚之后找不到数据
                    stockLockedTo.setDetail(target);
//                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", stockLockedTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", stockLockedTo);
                    break;
                }else {
                    // 当前仓库锁失败，尝试下一个仓库

                }
            }
            if (!skuStocked){
                // 当前商品所有仓库都没锁住
                throw new NoStockException(skuId);
            }
        }
        // 只有全都锁成功才会到这里
        return true;
    }

    /**
     * 不抛出异常就是成功
     * @param to
     */
    @Override
    public void unlockStock(StockLockedTo to) {
        System.out.println("收到解锁库存的消息");
        StockDetailTo detail = to.getDetail();
        Long detailId = detail.getId();
        // 解锁
        // 1、查询数据库关于这个订单的锁定库存信息
        // 有：证明库存锁定成功
        //      解锁：订单情况
        //          1、没有这个订单：必须解锁
        //          2、有这个订单。不是解锁库存
        //              订单状态：已经取消：解锁库存
        //                      未取消：不能解锁
        // 没有：库存锁定失败，库存回滚了，这种情况无需解锁
        WareOrderTaskDetailEntity byId = taskDetailService.getById(detailId);
        if (byId != null) {
            // 解锁
            Long id = to.getId(); // 库存工作单的id
            WareOrderTaskEntity taskEntity = taskService.getById(id);
            String orderSn = taskEntity.getOrderSn();
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0){
                // 订单数据返回成功
                OrderVo orderVo = r.getData(new TypeReference<OrderVo>() {
                });
                // 订单状态要为已取消状态才会解锁库存
                if (orderVo == null || orderVo.getStatus().equals(CartConstant.OrderStatusEnum.CANCLED.getCode())){
                    if (byId.getLockStatus() == 1){
                        // 解锁库存
                        unlockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
//                    channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
                    }
                }
            }else {
                // 消息拒绝以后重新放入队列中，让别人继续消费
                throw new RuntimeException("远程服务失败");
//                channel.basicReject(message.getMessageProperties().getDeliveryTag(), true);
            }
        }
    }

    /**
     * 防止订单服务卡村，导致订单状态一直无法修改，库存消息优先到期，订单消息一直为新建状态，库存无法解锁
     * @param to
     */
    @Transactional
    @Override
    public void unlockStock(OrderTo to) {
        String orderSn = to.getOrderSn();
        // 查一下最新的库存状态
        WareOrderTaskEntity taskEntity = taskService.getOrderTaskByOrderSn(orderSn);
        Long id = taskEntity.getId();
        // 按照工作单找到所有没有解锁的库存，进行解锁
        List<WareOrderTaskDetailEntity> entities = taskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>().
                eq("task_id", id).
                eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : entities) {
            unlockStock(entity.getSkuId(), entity.getWareId(), entity.getSkuNum(), entity.getId());
        }

    }

    @Data
    class SkuWareHasStock{
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}
